Guys,
I had an interesting conversation with a Ford mechanic yesterday morning while he recharged my '90 SC with R134a. The car had already been converted by the previous owner.
The mechanic told me that there is no major conversion on the '90 SC's. He said the only thing that Ford does is to replace the O-rings with the newer, green O-rings. Then he said they add a specific amount of that "PAG" oil, which is apparently an ester oil made to be compatible with the newer style refridgerant. Finally, they screw on the adapters for the fittings on the A/C lines, and charge the system up.
I asked specifically about some of the other things I had heard about, like orifice tubes, different compressors and dryers, and he said that none of that should have needed to be changed. Is this guy for real, or have there been a lot of Super Coupe owners getting sharked for A/C conversions???
On my car, the O-rings were in fact all the green type, and the adapters were in place to allow the R134a to be pumped in. Otherwise, it looks like nothing has been changed from stock.
Who's telling the truth here???
Best regards,
Sean